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feuille/util.c

85 lines
2.3 KiB
C

/*
* util.c
* Common utils.
*
* Copyright (c) 2022
* Tom MTT. <tom@heimdall.pm>
*
* This file is licensed under the 3-Clause BSD License.
* You should have received a copy of the 3-Clause BSD License
* along with this program. If not, see
* <https://basedwa.re/tmtt/feuille/src/branch/main/LICENSE>.
*/
#define _DEFAULT_SOURCE
#include "util.h"
#include <stdarg.h> /* for va_end, va_list, va_start */
#include <stdio.h> /* for snprintf, vsnprintf, vfprintf, BUFSIZ, stderr */
#include <stdlib.h> /* for exit */
#include <syslog.h> /* for syslog, LOG_DEBUG, LOG_ERR */
#include <unistd.h> /* for getpid */
#include "feuille.h" /* for Settings, settings */
/* reuse that buffer for syslogs */
char syslog_buffer[BUFSIZ];
/**
* Die with an error message.
* exit_code: the exit code to be used.
* string: the string to be displayed. Printf format is supported.
*/
void die(int exit_code, char *string, ...)
{
va_list ap;
va_start(ap, string);
vfprintf(stderr, string, ap);
va_end(ap);
exit(exit_code);
}
/**
* Send an error message to syslog.
* string: the string to be displayed. Printf format is supported.
*/
void error(char *string, ...)
{
va_list ap;
va_start(ap, string);
/* prepend the PID of the current thread */
int length = snprintf(syslog_buffer, sizeof(syslog_buffer), "ERROR[%d]: ", getpid());
/* send the string to syslog */
vsnprintf(syslog_buffer + length, sizeof(syslog_buffer) - length, string, ap);
syslog(LOG_ERR, "%s", syslog_buffer);
va_end(ap);
}
/**
* Send a message to syslog if in verbose mode.
* string: the string to be displayed. Printf format is supported.
*/
void verbose(int level, char *string, ...)
{
if (settings.verbose < level)
return;
va_list ap;
va_start(ap, string);
/* prepend the PID of the current thread */
int length = snprintf(syslog_buffer, sizeof(syslog_buffer), "DEBUG%d[%d]: ", level, getpid());
/* send the string to syslog */
vsnprintf(syslog_buffer + length, sizeof(syslog_buffer) - length, string, ap);
syslog(LOG_DEBUG, "%s", syslog_buffer);
va_end(ap);
}